项目来源

福建省自然科学基金

项目主持人

黄溢声

项目受资助机构

中国科学院福建物质结构研究所

立项年度

2015

立项时间

未公开

项目编号

2015J01232

研究期限

未知 / 未知

项目级别

省级

受资助金额

6.00万元

学科

工程与材料科学部

学科代码

未公开

基金类别

高校产学合作项目

关键词

飞秒激光晶体 ; 晶体材料 ; 硅酸盐 ; 掺Cr3+离子 ; 晶体生长 ; 激光性能 ; Femtosecond laser crystal ; crystal materials ; Silicates ; Cr3+-doped ion ; Crystal growth ; Laser properties

参与者

未公开

参与机构

未公开

项目标书摘要：飞秒激光是激光技术中重要的一种技术，飞秒激光以其特有的超短脉冲、超强峰值功率和聚焦能力强等特点，在微电子加工、生物医疗和高速光通讯等众多领域具有广泛的应用。随着激光二极管(LD)泵浦固体激光器的发展，探索新型的适合LD泵浦的近红外飞秒激光晶体成为研究热点。本研究将结构分析和晶体场理论有机地结合起来，系统分析硅酸盐化合物的结构类型，探索出具有弱晶体场的硅酸盐化合物ABSi2O6(A=Na,K,Ca;B=Mg,Al),其[BO6]配位体为八面体，适合Cr3+离子进入而产生宽带吸收和发射，从而获得适合AlGaInP LD泵浦的飞秒激光材料。合成研究该系列晶体的粉末结构和相图。探索该系列晶体的生长机理和缺陷产生机理，通过特殊的温场设计、分阶段退火和加入助熔剂等方法，解决生长速度慢、易形成包裹体、退火时易开裂等问题，生长出光学质量优良的Cr3+:ABSi2O6晶体。测定晶体的各种光学、热和机械等性能。研究晶体的光谱性能，通过光谱分析，理论计算等确定最佳的掺杂浓度。当掺Cr3+离子浓度达到2 at.%时，晶体具有两个分别以460 nm和650 nm为中心的宽吸收带，同时具有峰值中心位于986.1 nm处且覆盖范围在750-1300 nm的宽带发射光谱，其在峰值处的发射截面为14.39×10−20 cm2 并且发射谱带的半峰宽达到212 nm。因此，具有宽带吸收和发射特征且有较大吸收和发射截面的Cr3+:CaMgSi2O6晶体具备优异的光谱性能。本项目对ABSi2O6(A=Na,K,Ca;B=Mg,Al)系列晶体已进行初步研究，并对Cr3+:CaMgSi2O6晶体进行大量的生长和性能研究，结果表明该晶体具有优秀的热学和光学性能，是一种非常有前途的飞秒激光晶体材料。

Application Abstract: Femtosecond laser technology is an important laser technology.Femtosecond laser with its unique characteristics of ultra-short pulse,super-peak power and focusing ability has a wide range of applications in micro-electronics processing,biomedical,and high-speed optical communication.With the increasing interest in LD pumped solid state lasers,research on more efficient new near infrared femtosecond laser crystals for diode pumping becomes more important.By using the structural analysis method and crystal field theory to analysize the silicates’structure,a group silicate compounds with the formula of ABSi2O6(A=Na,K,Ca;B=Mg,Al)were found to have weak crystal field.Their[BO6]ligand with an octahedral structure is suitable for Cr3+ion,broadband absorption and emission are expected when Cr3+ion is doped,then new femtosceond laser materials would be obtained.Synthetic of the series of crystal powder structure and phase diagram are studied.This work explored the growth mechanism and defect mechanism of the crystal.By using the innovative methods as follows:designing special temperature field for the growing furnace,annealing with special program,adding flux and so on,bulk new femtosecond laser crystals of Cr3+:ABSi2O6 with big dimension and good optical quality will be obtained.In order to determine the best concentration of Cr ions the spectrum will be measured and the theoretical calculation will be analyzed.A variety of optical,thermal and mechanical properties of the crystal will be tested.When the Cr3+ions have reach 2 at.%in the crystal,the CaMgSi2O6 crystal has two broad absorption bands which center at 460 nm and 652 nm,respectively,and a board emission band in the range of 750-1300 nm with center at 986.1 nm.The emission cross-section σe at 986.1 nm is 14.39×10−20 cm2 and the emission FWHM is up to 212 nm.The Cr3+:CaMgSi2O6 crystal with broadly absorption and emission spectra,large absorption and emission cross sections demonstrate excellent spectroscopic features.In this project,a series of crystals of ABSi2O6(A=Na,K,Ca;B=Mg,Al)have been studied,and the growth and properties of Cr3+:CaMgSi2O6 crystals have been studied in detail.The results show that the crystals have excellent thermal and optical properties.Therefore the Cr3+:CaMgSi2O6 crystal is a promising femtosecond laser material.

项目受资助省

福建省